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6963 results about "Timestamp" patented technology

A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. The term derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card.

Synchronous collaboration based on peer-to-peer communication

A peer-to-peer protocol is based on the use of global timestamps and client priorities in serializing modifications to a shared workspace of real-time collaboration. The method caters to dynamic clients wherein a client can leave or join an ongoing collaboration session as long as there is always at least one client present / remaining in the collaboration session. The method can support multiple definitions of a modification, including partitioning-based definitions, wherein the method provides full support for locking of partitions, and a full treatment of inter-partition synchronization via a modification definition over multiple partitions. The method is capable of utilizing the many standard methods of creating a global, distributed, synchronized clock for the global timestamps utilized by it. The method is rollback-based for correcting tentative but incorrect serializations, and provides additional backup in terms of checkpoints for additional safety and for the support of lightweight, pervasive clients. The method includes many optimizations for efficiency, and includes a method of switching to and back from distributed server-based serialization for the periods when the network response is better suited to a distributed server than the peer-to-peer protocol.
Owner:INT BUSINESS MASCH CORP

Method and system for providing site independent real-time multimedia transport over packet-switched networks

Embodiments of the invention enable minimum latency site independent real-time video transport over packet switched networks. Some examples of real-time video transport are video conferencing and real-time or live video streaming. In one embodiment of the invention, a network node transmits live or real-tine audio and video signals, encapsulated as Internet Protocol (IP) data packets, to one or more nodes on the Internet or other IP network. One embodiment of the invention enables a user to move to different nodes or move nodes to different locations thereby providing site independence. Site independence is achieved by measuring and accounting for the jitter and delay between a transmitter and receiver based on the particular path between the transmitter and receiver independent of site location. The transmitter inserts timestamps and sequence numbers into packets and then transmits them. A receiver uses these timestamps to recover the transmitter's clock. The receiver stores the packets in a buffer that orders them by sequence number. The packets stay in the buffer for a fixed latency to compensate for possible network jitter and/or packet reordering. The combination of timestamp packet-processing, remote clock recovery and synchronization, fixed-latency receiver buffering, and error correction mechanisms help to preserve the quality of the received video, despite the significant network impairments generally encountered throughout the Internet and wireless networks.
Owner:QVIDIUM TECH

Method and apparatus for exchanging event information between computer systems that reduce perceived lag times by subtracting actual lag times from event playback time

Mechanisms and techniques provide the system that allows a sending computer system to capture and store event information related to events that transpire on a sending computer system in event batches. The event information can include event functionality related to event object in the timestamp related to the event. Periodically, in response to the occurrence of the batch transfer condition, the sending computer system transmits an event batch monthly computer network for receipt by a receiving computer system. The event batch may be processed through a collaboration adapter on the networks while prior to being send to the receiving computer system. Upon receipt of an event batch at the receiving computer system, the receiving computer system can compute a lag time required to receive the event batch. The receiving computer system can then recreate events based on the event information in the event batches while compensating for network lag time incurred during transmission of the event batch between a sending and receiving computer systems. By compensating for network lag during the recreation or playback of events, the system of the invention avoids the receiving computer system from reproducing events in a choppy or discontinuous manner or from getting left behind during event recreation due to accumulations of network lag time.
Owner:CISCO TECH INC

Network Audio Distribution System and Method

System and methods for distributing audio content from plural audio sources to plural client terminals located on a network. The system includes an audio source interface that is coupled to receive raw audio from a first audio source, and converts the raw audio into a digital audio clip that is incorporated into a digital audio packet, which further contains a timestamp and a channel identity corresponding to the first audio source. A network audio server is coupled to receive the digital audio packet from the audio source interface, and operates to format the digital audio packet into a digital audio file that is compliant with the network, and store the digital audio file at a network address. The network audio server generates a directory packet that includes the network address of the digital audio file, the channel identity, and the timestamp, and couples the directory packet to a directory server located on the network. The directory server receives the directory packet and generates a directory stream, including at least a portion of the directory packet, and couples the directory stream through the network to a first client terminal. The first client terminal receives the directory stream and selectively identifies the directory packet according to a client profile, and subsequently communicates an audio file request through the network, requesting the digital audio file from the network audio server. Then, upon receipt of the audio file request, the audio server responds by coupling the digital audio file to the client terminal through the network.
Owner:TELEGRAPH PEAK TECH LLC

Technique for synchronizing multiple access controllers at the head end of an access network

A technique is described which may be used to synchronize a plurality of different access controllers which control a plurality of distinct ports at the Head End of an access network. In the context of a cable network, the technique of the present invention may be used to synchronize desired upstream and/or downstream channels across different line cards within a Cable Modem Termination System (CMTS). The technique involves utilizing a master time reference device which maintains and updates a current time reference, and periodically distributes synchronization signals to desired line cards in the system in order to synchronize these line cards. In a specific embodiment, the synchronization signals include current timestamp data generated from the master time reference device and distributed to all (or selected) line cards in the system. A slave time reference device on each of the line cards receives the periodic synchronization updates and uses the synchronization data to remain synchronized with the master time reference device. There are also provisions in this protocol to allow for hot insertion and removal of line cards, software reset or loading of the master and/or slave time reference devices, and redundant master time reference devices, including master time reference device fault detection and automatic fail over.
Owner:CISCO TECH INC

Group key distribution

A method for distributing a secret key from a key holder H to intended group members M. The method assumes that during the distribution process each party, a group member M and the key holder H, can decrypt and encrypt exchanged information such that the encrypter knows that the decrypter will be the intended party. The method preferably uses a public key / private key encryption technique in which, for example, a trusted Certificate Authority in a public key infrastructure signs the certificates to provide the public keys involved in the encryption. Alternatively, the method, together with a symmetric cipher, uses a shared secret, established in an authenticated mechanism that is outside the information exchanges of the invention. Additionally, the method uses a strong mixing function that takes several items of data as input and produces a pseudo-random authentication (or digest). Inputs to the mixing function include identity stamps that are generated by each member M and key holder H. These inputs can be the identity of the stamp generator, such as a network address, port, or protocol, a timestamp, and / or a secret value that is known only to the stamp generator. The stamps include information to bind member M if generated by key holder H, and to bind key holder H if generated by member M. Consequently, the invention authenticates each communication exchange between member M and key holder H.
Owner:CISCO TECH INC

System and method for authoring and providing information relevant to the physical world

A system and method capable of reading machine-readable labels from physical objects, reading coordinate labels of geographical locations, reading timestamp labels from an internal clock, accepting digital text string labels as input obtained directly from a keyboard type input device, or indirectly using a speech-to-text engine transforming any other label type information encoding into digital data by some transduction means, and treating these different labels uniformly as object identifiers for performing various indexing operations such as content authoring, playback, annotation and feedback. The system further allows for the aggregating of object identifiers and their associated content into a single addressable unit called a tour. The system can function in an authoring and a playback mode. The authoring mode permits new audio / text / graphics / video messages to be recorded and bound to an object identifier. The playback mode triggers playback of the recorded messages when the object identifier accessed. In the authoring mode, the system supports content authoring that can be done coincident with object identifier creation thereby enabling authored content to be unambiguously bound to the object identifier. In the playback mode, the system can be programmed to accept / solicit annotations / feedback from a user which may also be recorded and unambiguously bound to the object identifier.
Owner:NAVISCAN LLC

Processing operations associated with resources on a local network

Preferred embodiments of the invention provide a method and system for processing operations associated with resources on a local network. Aspect of the invention include receiving periodic messages containing resource information from network devices connected to the local network, wherein the resource information includes user-requestable services offered by the network device, and data stored by the network device having a mime type. The resource information from each of the messages and a timestamp are stored in a repository. From the stored timestamp and resource information it can be determined which user-requestable services and data having a mime type were available on the network over a predetermined time period. A view of the user-requestable services and data having a mime type that were available on the network over the predetermined period can then be generated, thereby enabling generation of current, past, and dynamic views of the user-requestable services offered by devices connected to the network and the data having a mime type stored by the devices. In a further embodiment, the system enables operations associated with the resources to be performed or scheduled at a time when the resources are unavailable via the network by performing or scheduling the operations on the corresponding resource identifiers stored in the repository.
Owner:SCENERA TECH

Picture-in-picture and multiple video streams using slice-based encoding

Methods for slice-based encoding of program guides and user interfaces. The program guides include multiple video streams for picture-in-picture and other applications. A method for encoding the program guide includes encoding a first set of slices for each of a plurality of graphics pages; and encoding a second set of slices for each of a plurality of video streams. The user interfaces are multi-functional and may be used for electronic commerce and other applications. A method of generating the user interface includes encoding a set of slices for each of a plurality of objects, each object being characterized by an identity, at least one attribute, and at least one operation. In one embodiment of this method, the plurality of objects include an electronic commerce object, where the electronic commerce object is attributed with a first hyper text markup language (HTML) page. A head-end centric system and apparatus for encoding and delivery of realtime content, including: a non-realtime content source for providing non-realtime content; a non-realtime encoder for encoding the non-realtime content into encoded non-realtime content; a realtime encoder source for providing realtime video and audio content; a realtime encoder for encoding the realtime video and audio content into encoded realtime video an audio; a remultiplexor for repacketizing the encoded non-realtime content and the encoded realtime video and audio into transport packets; and a re-timestamp unit coupled to the remultiplexor for providing timestamps to be applied to the transport packets in order to synchronize the realtime and non-realtime content therein.
Owner:TIVO CORP
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